Custom EDID in Wayland

Graphics / Linux Linux
1

How do you specify a custom EDID? I want to limit my display’s VRR range from 48-240 to something like 80-240 as that is supposed to help with flicker. The only documentation I can find is for nvidia-xconfig and X11, how do I do it under Wayland?

2

Well I have bad news for you.

https://bugs.kde.org/show_bug.cgi?id=491411
Overriding the EDID is easy but ATM the driver disables VRR if you override it under wayland… at least it does on my case, 3090 , HDMI 2.1 , LG C1

here is my service:
/etc/systemd/system/edid.service

[Unit]
Description=EDID Override Service
Before=sddm.service
RequiresMountsFor=/usr/lib/firmware/edid/lg.bin

[Service]
Type=oneshot
ExecStart=/bin/sh -c ‘for edid_path in /sys/kernel/debug/dri/*/HDMI-A-1/edid_override; do if [ -f “$edid_path” ]; then cat /usr/lib/firmware/edid/lg.bin > “$edid_path”; fi; done’
RemainAfterExit=true

[Install]
WantedBy=multi-user.target

3

Hm, the script executes OK (changed the path for DP instead of HDMI, and GDM instead of SDDM) but the range is still shows up as 48-240 in Gnome-settings. I’m not sure copying that file into /sys/kernel/debug/dri is actually doing anything.

4